1996 Pontiac Sunfire Logo
Anonymous Posted on Jan 16, 2011

My blower for heat is only blowing cold air. I have checked all fuses and have changed the thermostat. I think its the control inside the dash that regulates how cold or hot the air is

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Duane Wong

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  • Pontiac Master 6,826 Answers
  • Posted on Jan 16, 2011
Duane Wong
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If the heater core (2 heater core tubes at firewall) is hot and the interior is cold, then the blend door is causing your problem. It is controlled by electrical and vacuum components.

Also, note that the heater core tubes have a valve that is replaced with the entire hose.

Also, the heater core, if plugged can be replaced as follows:
Heater Core REMOVAL & INSTALLATION

  1. Disable the SIR system, as outlined in this section.
  2. Disconnect the negative battery cable.
  3. Properly drain the cooling system.
  4. Raise and safely support the vehicle.
  5. Detach the heater hoses from the heater core.
  6. Carefully lower the vehicle.
  7. Remove the instrument panel. For details, please refer to the procedure located in Section 10 of this manual.
  8. Remove the DERM with the attaching bracket.
  9. Detach the heater core cover.
  10. Unfasten the heater core mounting clamps, then remove the heater core. Fig. 1: Exploded view of the heater core and related components my blower for heat is only blowing cold air. I - 87956021.gif
    To install:
  11. Position the heater core, then secure with the mounting clamps.
  12. Attach the heater core cover.
  13. Install the DERM with the attaching bracket.
  14. Install the instrument panel, as outlined in Section 10 of this manual.
  15. Raise and safely support the vehicle.
  16. Connect the heater hoses to the core.
  17. Carefully lower the vehicle.
  18. Properly refill the engine cooling system and check for leaks.
  19. Enable the SIR system.
  20. Connect the negative battery cable, then start the engine and check for proper system operation and/or leaks.
next.gif

  • Duane Wong
    Duane Wong Jan 16, 2011

    INTERIOR


    Instrument Panel and Pad


    REMOVAL & INSTALLATION



        If equipped, disable the SIR system, as outlined in Section 6 of this manual.
          If not done already, disconnect the negative battery cable.
            Unfasten the defroster grille retaining screw, then remove the grille.
              To remove the instrument panel end-caps, for Cavalier, use a suitable prytool. Position the tool behind the cover and carefully pry outward. For the Sunfire, unfasten the end-cap retaining screws and remove the cap.





              Fig. 1: Air distribution duct mounting - Cavalier shown







              Fig. 2: Location of the air distribution duct mounting - Sunfire shown







              Fig. 3: Detach the instrument panel lamp connector




                For the Cavalier, remove the instrument panel trim pad.
                  Remove the instrument cluster trim plate.
                    As outlined in Section 6 of this manual, remove the heater and A/C control panel.
                      Remove the radio assembly, as outlined in Section 6 of this manual.
                        Unfasten the air distribution ducts.





                        Fig. 4: Instrument panel-to-tie bar attachments - Cavalier shown







                        Fig. 5: Instrument panel-to-tie bar mounting - Sunfire shown




                          Detach the instrument panel compartment lamp electrical connector.
                            Unfasten the screws to the tie bar, then remove the instrument panel from the tie bar.
                            To install:

                              Position the instrument panel to the tie bar, then secure with the retaining screws.
                                Attach the instrument panel compartment lamp connector.
                                  Fasten the air distribution ducts.
                                    Install the radio and the heater and A/C control.
                                      Install the instrument cluster trim plate.
                                        For the Cavalier, install the instrument panel trim pad.
                                          Install the end caps.
                                            Position the defroster grille, then secure with the retaining screw,
                                              Enable the SIR system, if equipped. For details, please refer to the procedure located in Section 6 of this manual.
                                                Connect the negative battery cable.


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  • Duane Wong
    Duane Wong Jan 16, 2011

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